Ilib:
a library (with tools and examples) written in C that can read,
create, manipulate and save images

Java Calendar Tools:
a Java-based library for developing calendar applications
based on the iCal standard

GTimer: a UNIX/Linux application to track how you spend your time on various tasks

k5n's most prominent work is WebCalendar,
an Open Source web-based calendar/scheduling system written in PHP.
WebCalendar has been under development since 2000 and continues to
evolve.

After years of development, testing, and user feedback from around
the world, WebCalendar is a very stable and feature-rich product that
compares very favorably with the best commercial calendars.

k5n Desktop Calendar

k5n's newest application is the k5n
Desktop Calendar (aka "k5nCal"). This Java/Swing-based calendar
application is under development but already contains many of the
features found in commercial desktop calendars:

Support for multiple calendars

Subscribe to remote iCalendar-based calendars like those
found on icalshare